2D Functional Nanomaterials

14Piezoelectric Properties of Na_1−xK_xNbO₃ near x = 0.475, Morphotropic Phase Region

Surendra Singh and Narayan S. Panwar

H.N.B. Garhwal University, Department of Instrumentation Engineering, Srinagar (Garhwal), Uttarakhand, 246174, India

14.1 Introduction

Certain materials have a property that on applying mechanical pressure, they accumulate charges on their surfaces and the produced charges are proportional to the applied mechanical pressure; this effect is known as the “Direct Piezoelectric Effect.” This phenomenon was discovered by Pierre and Jacques Curie (1880) in quartz. The prefix “piezo” is a Greek word meaning “to press.” Materials also show this phenomenon conversely, strain is produced by the applied electric field, known as “converse ...